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This is needed in order to switch frame resource loading to use the new
safe_browsing::BrowserURLLoaderThrottle (once feature NavigationMojoResponse is
enabled).

Bug: 715673
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: If7919dbdd2ad0c8b09c38a0ba350f04c02ab5f3b
Reviewed-on: https://chromium-review.googlesource.com/887796
Commit-Queue: Yuzhu Shen <yzshen@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533781}